289
FNCA52 TJSJ 070853
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
453 AM AST SUN DEC 7 2025
DISCUSSION
A SLOT OF DRIER AIR WILL MOVE IN DURING THE PEAK HOURS OF THE DAY,
LEADING TO A QUICK DROP IN RH ACROSS THE SOUTHERN COASTAL PLAINS,
WHERE VALUES MAY BRIEFLY NEAR OR SLIP BELOW LOCAL THRESHOLDS.
EASTERLY TO EAST-SOUTHEASTERLY WINDS OF 12 TO 18 MPH, WITH SEA-
BREEZE GUSTS AROUND 20 TO 25 MPH, WILL RESEMBLE YESTERDAY’S PATTERN.
PASSING MORNING SHOWERS AND ISOLATED AFTERNOON CONVECTION OVER THE
INTERIOR AND WEST WILL OFFER ONLY LIMITED MOISTURE RECOVERY. KBDI
VALUES REMAIN WELL BELOW CRITICAL LEVELS, AND SOIL MOISTURE, CROP
STRESS, AND 30-DAY PERCENT-OF-NORMAL DATA ALL CONTINUE TO INDICATE
THAT FUELS ARE NOT CRITICALLY DRY ON AN AREAWIDE SCALE.
AS A RESULT, THE FIRE WEATHER THREAT REMAINS OVERALL LOW, WITH ONLY
A LOCALIZED ELEVATED RISK CONFINED TO THE SOUTHERN COASTAL PLAINS
DURING PEAK HEATING.
PRZ014-080900-
SOUTHEAST COASTAL PLAINS-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 10
TEMP (24H TREND) 88 (+2) 70 (-3) 87
RH % (24H TREND) 58 (+3) 95 (+4) 56
WIND 20FT/EARLY(MPH) E 13 G21 E 10 SE 12 G19
WIND 20FT/LATE(MPH) E 13 G21 E 10 SE 12 G19
MIXING HGT(FT-AGL/MSL)4990 4470
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 69860 53640
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-080900-
SOUTHERN HILLS-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 40
TEMP (24H TREND) 84 (+3) 67 (-3) 84
RH % (24H TREND) 63 (-3) 98 (+6) 59
WIND 20FT/EARLY(MPH) E 12 E 11 SE 11
WIND 20FT/LATE(MPH) E 12 E 11 SE 11
MIXING HGT(FT-AGL/MSL)5230 4950
TRANSPORT WND (MPH) E 16 E 13
VENT RATE (KT-FT) 73220 54450
DISPERSION 5 5
DSI 5 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-080900-
NORTH COASTAL PLAINS-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40
TEMP (24H TREND) 88 (+2) 69 (-3) 88
RH % (24H TREND) 60 (-4) 100 (+5) 55
WIND 20FT/EARLY(MPH) E 17 G19 E 16 E 12
WIND 20FT/LATE(MPH) E 17 G19 E 16 E 12
MIXING HGT(FT-AGL/MSL)5040 4830
TRANSPORT WND (MPH) E 16 E 13
VENT RATE (KT-FT) 70560 53130
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-080900-
NORTHERN HILLS-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 10
TEMP (24H TREND) 86 (+2) 67 (-3) 86
RH % (24H TREND) 62 (-1) 99 (+5) 54
WIND 20FT/EARLY(MPH) E 14 E 13 E 10
WIND 20FT/LATE(MPH) E 14 E 13 E 10
MIXING HGT(FT-AGL/MSL)5190 5620
TRANSPORT WND (MPH) E 14 E 9
VENT RATE (KT-FT) 62280 44960
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-080900-
WEST COAST-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 50
TEMP (24H TREND) 88 (+1) 68 (-3) 88
RH % (24H TREND) 61 (-1) 97 (+5) 59
WIND 20FT/EARLY(MPH) E 13 E 10 E 13
WIND 20FT/LATE(MPH) E 13 E 10 E 13
MIXING HGT(FT-AGL/MSL)4590 4850
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 45900 48500
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-080900-
EASTERN INTERIOR-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 20
TEMP (24H TREND) 85 (+2) 68 (-3) 85
RH % (24H TREND) 62 (-5) 100 (+3) 58
WIND 20FT/EARLY(MPH) E 13 E 12 SE 12
WIND 20FT/LATE(MPH) E 13 E 12 SE 12
MIXING HGT(FT-AGL/MSL)5230 4660
TRANSPORT WND (MPH) E 16 SE 14
VENT RATE (KT-FT) 73220 55920
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-080900-
LUQUILLO MOUNTAIN RANGE-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 40
TEMP (24H TREND) 81 (+3) 66 (-4) 81
RH % (24H TREND) 68 (-6) 100 (0) 64
WIND 20FT/EARLY(MPH) E 12 E 10 SE 11
WIND 20FT/LATE(MPH) E 12 E 10 SE 11
MIXING HGT(FT-AGL/MSL)4240 4110
TRANSPORT WND (MPH) E 17 SE 16
VENT RATE (KT-FT) 63600 57540
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-080900-
CENTRAL MOUNTAIN RANGE-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 10 60
TEMP (24H TREND) 84 (+4) 66 (-2) 84
RH % (24H TREND) 62 (-4) 98 (+5) 57
WIND 20FT/EARLY(MPH) E 10 E 8 E 9
WIND 20FT/LATE(MPH) E 10 E 8 E 9
MIXING HGT(FT-AGL/MSL)5590 6110
TRANSPORT WND (MPH) E 13 E 8
VENT RATE (KT-FT) 61490 42770
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-080900-
CAYEY MOUNTAIN RANGE-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 40 60 0
TEMP (24H TREND) 80 (+1) 67 (-2) 80
RH % (24H TREND) 69 (-4) 100 (+1) 65
WIND 20FT/EARLY(MPH) E 11 E 9 E 10
WIND 20FT/LATE(MPH) E 11 E 9 E 10
MIXING HGT(FT-AGL/MSL)4520 4200
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 67800 63000
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-080900-
VIEQUES-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 30
TEMP (24H TREND) 86 (0) 73 (-1) 86
RH % (24H TREND) 59 (-3) 95 (-2) 57
WIND 20FT/EARLY(MPH) E 16 G20 E 16 G20 E 13 G17
WIND 20FT/LATE(MPH) E 16 G20 E 16 G20 E 13 G17
MIXING HGT(FT-AGL/MSL)3710 3710
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 59360 66780
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-080900-
CULEBRA-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 30
TEMP (24H TREND) 87 (+1) 74 (-2) 87
RH % (24H TREND) 58 (-5) 92 (-1) 56
WIND 20FT/EARLY(MPH) E 16 G19 E 14 G19 SE 14 G18
WIND 20FT/LATE(MPH) E 16 G19 E 14 G19 SE 14 G18
MIXING HGT(FT-AGL/MSL)3760 4120
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 60160 74160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-080900-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 89 (+2) 71 (-2) 89
RH % (24H TREND) 58 (+6) 96 (+10) 57
WIND 20FT/EARLY(MPH) E 17 G25 E 16 SE 16 G23
WIND 20FT/LATE(MPH) E 17 G25 E 16 SE 16 G23
MIXING HGT(FT-AGL/MSL)4930 4810
TRANSPORT WND (MPH) E 18 E 17
VENT RATE (KT-FT) 78880 72150
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-080900-
SAINT THOMAS AND SAINT JOHN-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 20
TEMP (24H TREND) 86 (+1) 72 (-3) 86
RH % (24H TREND) 61 (-3) 98 (+3) 59
WIND 20FT/EARLY(MPH) E 14 G19 E 14 G19 E 14 G19
WIND 20FT/LATE(MPH) E 14 G19 E 14 G19 E 14 G19
MIXING HGT(FT-AGL/MSL)3920 4040
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 62720 76760
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-080900-
ST CROIX-
453 AM AST SUN DEC 7 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 10
TEMP (24H TREND) 86 (+1) 73 (-3) 85
RH % (24H TREND) 61 (-2) 92 (0) 60
WIND 20FT/EARLY(MPH) E 16 G19 E 14 G17 E 13 G17
WIND 20FT/LATE(MPH) E 16 G19 E 14 G17 E 13 G17
MIXING HGT(FT-AGL/MSL)4680 3690
TRANSPORT WND (MPH) E 21 E 17
VENT RATE (KT-FT) 84240 55350
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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